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Around here it is okay to pipe the t&p to the floor of the garage if there is a step between the garage and the entry to the home. Meaning that if it were to leak there would not be secondary damage in the home! Otherwise it would have to be piped outside with an approved piping material which can be pex in some areas and not in others. Seems to be some eye-brow raising with the pex fittings that fit inside of pex with the crimp ring as to whether or not you are reducing the size. The code seems to be based on pipe sizes not true dimensions. As long as you used a 3/4 line you would use a 3/4 fitting and everything is 3/4, but the actual bore of that fitting is prob 1/2-5/8". Doesn't see as though it would matter to me. Even the reduction in size will flow more than the t&p fully open. Most inspectors argue that if you use pex coming in then you have not reduced the inlet size. Others are concerned about temps, but the manuf. don't rate the temp without pressure so there is no validity there. T&P should not be pressurized so i would think that it could handle the temp pretty easily? Again, its up to the code official for interpretation. I like black and white. Things like this annoy me.

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Uh oh... Different inspector different interpretation. same town same code.

The water heater is located in an outside laundry room on a concrete floor. So I ran the t&p to 6" above the floor. Now the inspector wants a pan under the heater. HUH UPC says "shall not discharge into a pan".

Uh oh... Different inspector different interpretation. same town same code.

The water heater is located in an outside laundry room on a concrete floor. So I ran the t&p to 6" above the floor. Now the inspector wants a pan under the heater. HUH UPC says "shall not discharge into a pan".

Must be evaluation time and the inspector has'nt red tagged enough.

It's stronger than that, it says it is prohibited. If it were me I would challenge him on it.